I have my own ideas as to what to do with unwanted board games, but plenty of folks around the world like to take those games with the missing pieces and turn them into works of craft.

Scrabble tiles are sold on eBay in bulk for mosaics, earrings, and the like, and various companies create jewelery and other items out of cards and pawns.

Eco-chic points us to this Flickr set displaying old board game boards turned in to coasters, and then gives several other suggestions. Planet Green does the same. For some boards, you can just frame them and hang them on your wall.